Spengler - Mozilla Web Service Inspector and Sample Generator
Spengler allows you to inspect a web service based on its WSDL file, displaying it in several human readable forms. It also allows you to create sample testcases that allow testing of the web service from Mozilla.
Spengler here is a rewrite/rearchitecture of my original attempt. The new version is lovingly called "Spengler Optimized". The unoptmized version can be found here